feat: add validators to FunctionImage

[guilhem-barthes]

Description

Fixes FL-1176 Fixes FL-1150

How has this been tested?

Checklist

• [ ] changelog was updated with notable changes
• [ ] documentation was updated

[linear[bot]]

FL-1150 Add validators on FunctionImage

FL-1176 Rename `FileValidator` to `SubstraFunctionArchiveValidator`

[guilhem-barthes]

/e2e

[guilhem-barthes]

/e2e

[Owlfred]

End to end tests: :x: FAILURE

Jobs status:

• Camelyon: :next_track_button:
• Dispatch Jobs: :heavy_check_mark:
• Documentation: :next_track_button:
• MNIST: :next_track_button:
• SubstraFL: :next_track_button:
• SubstraSDK / sdk: :x:

“Boy, that escalated quickly.” ― Ron Burgundy, Anchorman: The Legend of Ron Burgundy